Add Touch ID & Face ID in Swift
Authentication on iOS devices is really important. Let’s see how we can integrate a Touch ID & Face ID in our own application.
To integrate biometric authentication in your app first thing you need is LAContext
STEP 1: Create instance of LAContext
STEP 2: Check if current device has Biometric capability or not using following method
func canEvaluatePolicy(_ policy: LAPolicy, error: NSErrorPointer) -> Bool
STEP 3: If step 2 is true then you need to go ahead and ask for biometric input using below method
func evaluatePolicy(_ policy: LAPolicy, localizedReason: String) async throws -> Bool
STEP 4: Handling authenticationError depends on use case. Here are few simple most likely happened cases.
Please note that if your application is showing a Biometric alert and any other application interrupts (e.g. user drags down the notification centre drawer or a phone call came) it then it automatically dismisses with .systemCancel error.
Done, this are simple steps to integrate Biometric ID in your application.
Thanks for reading.
Cheers :-)
Complete code is here
